Siemens SINAMICS S120 Getting Started page 144

Performing basic parameterization
6.3 Drive axes
For synchronous motors, the pole position identification (PolID) determines the electrical
pole position that is required for the field-oriented control. Normally, the electrical pole
position is provided with absolute information by a mechanically adjusted encoder.
Note
The content of the "Rotor position synchronization" screen form depends on the encoder
used.
A PolID is not required for the following encoder properties:
● Absolute encoder (e.g. EnDat, DRIVE-CLiQ encoder)
● Encoder with C/D track and number of pole pairs ≤ 8
● Hall sensor
● Resolver with integer ratio from the number of motor pole pairs to the number of encoder
pole pairs
● Incremental encoder with an integer ratio from the number of motor pole pairs to the
number of encoder pulses
Note
Using the Function Manual
Please also refer to the description of the pole position identification provided in the
"
SINAMICS S120 Function Manual Drive Functions". The supplementary conditions for using
the individual techniques are also described in the appropriate chapter.
Determining the suitable technique for the pole position identification
Danger to life caused by the movement of the motor when measuring unbraked motors
When carrying out the measurement for motors that are not braked, the current that flows
can cause the motor to move, which in turn can lead to death or severe injuries.
• Ensure that nobody is present in the hazardous zone and that the mechanical system
Brake available
Motor can move freely
Motor has no iron
142
WARNING
can move freely.
Saturation-based
Possible
Possible
Not possible
Motion-based
Not possible
Required
Possible
Getting Started, 12/2018, 6SL3097-5AG30-0BP0
Elasticity-based
Required
Not possible
Possible